Chunhwa Jang, Hongxu Zhou, Elbashir Araud, Thanh H. Nguyen, R. Bhattarai
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引用次数: 0
摘要
在这项研究中,两种经木屑改良的生物砂过滤器(过滤器 A 砂:木屑 = 33%;过滤器 B 砂:木屑 = 50%;过滤器 C 砂:木屑 = 67%)的过滤效率和过滤质量都有所提高:67% 与 B 过滤器砂:木屑 = 50%:50%),并研究了它们去除 MS2 噬菌体和硝酸盐的能力。结果表明,过滤器 A 和过滤器 B 对硝酸盐的去除率分别高达 40% 和 36%,这表明硝酸盐的去除率随着木屑比例的增加而增加。这项研究强调了硝酸盐减少量与木屑比例增加之间的正相关性,这意味着通过改变砂和木屑的成分来微调硝酸盐去除率是可行的。在 39 周的时间里,W-BSF 过滤器 A 可以去除 1.91-log10(98.8%)的 MS2 噬菌体,过滤器 B 可以去除 1.88-log10(98.7%)的 MS2 噬菌体。砂-木屑比例的差异对 MS2 的减少量没有显著影响,这表明单个 W-BSF 可以长期保持相当好的病毒去除性能。这些结果表明,可以通过改变沙木屑的含量来调整硝酸盐的减少量,而不会影响病毒去除性能。微生物群落分析表明,W-BSF 对硝酸盐的去除主要归功于反硝化细菌,如链霉菌科、假单胞菌属和芽孢杆菌属,以及相对丰富的硝化细菌门。
Evaluation of woodchips-amended biosand filter for nitrate and MS2 bacteriophage reduction
In this study, two types of woodchip-amended biosand filters (Filter A sand: woodchip = 33%: 67% versus Filter B sand: woodchip = 50%: 50%, by volume) were constructed, and their abilities to remove MS2 bacteriophage and nitrate were investigated. The results indicated that Filter A and Filter B could reduce nitrate up to 40 and 36%, respectively, indicating that the nitrate reduction increased with the increase in woodchip proportion. The study underscores a positive correlation between nitrate reduction and proportional increase in woodchip content, implying the potential for fine-tuning nitrate removal by varying sand–woodchip compositions. W-BSFs could remove MS2 bacteriophage to 1.91-log10 (98.8%) by Filter A and 1.88-log10 (98.7%) by Filter B over 39 weeks. The difference in sand–woodchip proportion did not significantly impact the MS2 reduction, demonstrating that a single W-BSF can maintain its virus removal performance fairly well over a long-term period. These results indicated that the nitrate reduction could be adjusted by varying sand–woodchip contents without impacting virus removal performance. Microbial community analysis indicated that the nitrate removal by the W-BSFs could be attributed to the denitrifying bacteria, such as the family Streptomycetaceae, the genera Pseudomonas, and Bacillus, and relative abundances of the phylum Nitrospirae.